MARYLAND FLOW REPORT
Last Updated: December 4, 2025
Streamflow conditions across Maryland's river systems have been notably below average, with most rivers experiencing reduced flow rates that may impact water enthusiasts and ecosystems alike. The Susquehanna River at Conowingo, a major waterway, reports a current streamflow of 5260 cubic feet per second (cfs), a substantial reduction of 75.17% from normal levels, accompanied by a gage height of 9.34 feet. This significant drop suggests potential concerns for the nearby ecosystems and recreational activities, such as boating and fishing. The Potomac River, another key river and popular for whitewater trails near the nation's capital, similarly shows decreased flows (2700 cfs at Washington, D.C., and 2330 cfs at Point Of Rocks), down by over 65%, with gage heights at 2.97 and 1.24 feet respectively, indicating a possible flow drought.
In contrast, the Monocacy River at Monocacy Blvd in Frederick saw a notable rise in streamflow over the last 24 hours by 73.22%, reaching a flow of 414 cfs, which is still below normal by 46.02% but showing a significant recent increase. While this rise suggests a temporary reprieve from low flow conditions, it also raises the potential for localized flooding if trends continue. Similarly, the Antietam Creek near Sharpsburg and the Conococheague Creek at Fairview are well below normal flows by 53.74% and 66.36%, which could affect water-related activities in these areas. The overall trend of lower-than-normal streamflows throughout Maryland's river systems highlights the need for river and water enthusiasts to stay informed of current conditions, as low flows can impact the accessibility of rivers for recreation and the health of aquatic habitats, while sudden increases might indicate flooding risks.
Maryland's flow conditions are heavily influenced by its location along the Atlantic coast and the Chesapeake Bay, as well as its varied topography. The state experiences a humid subtropical climate, with hot and humid summers and mild winters. Major surface flows include the Potomac and Patuxent Rivers, which feed into the Chesapeake Bay. Reservoirs and dams such as the Conowingo Dam and Loch Raven Reservoir also contribute to the state's hydrology. The state's watershed includes the Chesapeake Bay watershed, which covers 64,000 square miles and includes six states and the District of Columbia. Snowpack in the Appalachian Mountains can also impact flow conditions in the state. Overall, Maryland's flow conditions are complex and influenced by a variety of factors.